The earlier this year I received a call to treat a house for flies. When I got there I did an inspection and found quite a few green flies all dead on the window ledge. I know that green flies associate with something dead. I also know that the green flies that go after a dead carcass are rather large, but the green flies I found are about half the size of the large ones. In any event I did a thorough inspection of the house, starting from the attic to the second floor and the first floor and finally the basement. I even checked the bottom of the furnace and the trap door at the bottom of the chimney. There wasn't anything dead in them. I've been back three times to treat the house and I can't find where they are coming from. The owner told me that they owned the house for two years and they had this problem from day one. They rent the house out and they have had other service techs there. No one has been able to solve this problem. I've spent hours treating every crack and crevice with chemicals labeled for flies and still no success. The first floor is where the majority of the flies are. Any ideas would greatly be appreciated.
My first observation is with respect to your applications of insecticides into all those cracks and crevices. This probably was not justified since you had not really identified a need for it. I recognize that if blow flies are breeding indoors the maggots often squirm their way into gaps and crevices to pupate, but without really seeing any maggots or fly pupae, the use of a toxin in this case should have been avoided. It would be interesting to know what those "other service techs" may have used too, but I suspect that somewhere along the line someone spent time fogging the place just to kill the adult flies. This, of course, pretty much never resolves a fly infestation if the source is indoors.
Mr. Pest Control
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